The opinion in support of the decision being entered today was
not written publication and is not binding precedent of the Board.
UNITED STATES PATENT AND TRADEMARK OFFICE
____________
BEFORE THE BOARD OF PATENT APPEALS
AND INTERFERENCES
____________
Ex parte BRENT KEETH
and LAYNE G. BUNKER
____________
Appeal No. 2005-1576
Application No. 09/885,217
____________
ON BRIEF
____________
Before RUGGIERO, GROSS, and BARRY, Administrative Patent Judges.
RUGGIERO, Administrative Patent Judge.
DECISION ON APPEAL
This is a decision on the appeal from the final rejecion of
claims 223, 225, 228-237, 247-250, 496, and 499-515.
The claimed invention relates to a voltage reference circuit
for supplying a reference voltage in which an active reference
circuit receives an external voltage and produces a reference
signal having a desired relationship with the external voltage.
The active reference circuit includes a current source utilizing
a current mirror to provide current to a diode stack having an
adjustable impedance. Further included is a unity gain amplifier
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